Dear P. Balister,
I needed to toggle gpio at the start and end of a function inside a software
code to evaluate its performance. However, now I realize it is not accurate to
do this from user space because extra delays will be introduced at kernel
space. Therefore, I will change this approach and I'll use some software
profiling technique.
Thank you so much for your time ans speedy replies.
Regards,
S. Yassin
HW Engineer
DLECS
________________________________
From: Sameh Yassin <sameh_yassi...@yahoo.com>
To: Philip Balister <phi...@balister.org>
Cc: GNURADIO <discuss-gnuradio@gnu.org>
Sent: Saturday, May 5, 2012 2:05 AM
Subject: Re: Making sure of uboot version
Hello dear,
I followed the instruction and updated my sd card image. Now, inside
/sys/class/gpio
$root@usrp-e1xx:/sys/class/gpio# ls
export gpio16@ gpio173@ gpiochip128@ gpiochip32@ unexport
gpio114@ gpio164@ gpio175@ gpiochip160@ gpiochip64@
gpio15@ gpio168@ gpiochip0@ gpiochip192@ gpiochip96@
They changed from last version as us said. However, none of these are connected
to the FPGA.
Should I try
$ echo 22 > /sys/class/gpio/export
$ echo "high" > /sys/class/gpio/gpio72/direction
or it is meaningless to create gpio "driver" in this way.
Regards,
S. Yassin
HW Engineer
DLECS
________________________________
From: Philip Balister <phi...@balister.org>
To: Sameh Yassin <sameh_yassi...@yahoo.com>
Sent: Thursday, May 3, 2012 1:30 PM
Subject: Re: Making sure of uboot version
On 05/03/2012 07:14 AM, Sameh Yassin wrote:
> Hello Dear,
>
> I've monitored the automatic boot and I think that is the latest version
>
> U-Boot 2011.06-00575-g6b73deb (Sep 07 2011 - 07:26:10)
It is not. You need to make an sd card with the e1xx-003 image on it.
See the link in the earlier email for instructions how to do this.
Philip
>
> I also checked uname -a
>
> 3.0.0.
>
>
> Regards,
> S. Yassin
> HW Engineer
> DLECS
>
>
> ________________________________
> From: Philip Balister <phi...@balister.org>
> To: Sameh Yassin <sameh_yassi...@yahoo.com>
> Cc: GNURADIO <discuss-gnuradio@gnu.org>
> Sent: Wednesday, May 2, 2012 3:02 PM
> Subject: Re: Using Sysfs to set a GPIO in Overo
>
> On 05/02/2012 08:16 AM, Sameh Yassin wrote:
>> Dear P. Balister,
>> I found that tutorial which explains very well how to create a GPIO folder
>> and set its direction
>> http://www.avrfreaks.net/wiki/index.php/Documentation:Linux/GPIO#gpio-sysfs
>>
>>
>> I searched for the misc GPIOs to make sure they are free and I'm pretty sure
>> that over_gpio0 and overo_gpio170 are free. the are not used at all inside
>> the code. I connected them to debug led0 and debug_led1 and used echo 1>
>> /sys/class/gpio/gpio0/value after setting the direction but nothing at all,
>> the two debug leds are off.
>>
>
> What version of the e100 image are you using. Can you
start by making
> sure you are using the latest?
>
> http://code.ettus.com/redmine/ettus/projects/usrpe1xx/wiki/FAQ#How-do-I-create-re-create-E1xx-SD-Card-Images
>
> I think earler images will not have access to gpio0 due to some pinmux
> stuff in u-boot. I need to double check 170 pinmuxing also. there should
> be some free gpios in the 20's with the current image.
>
>> Another question, what is the difference between gpio0 and gpiochip0 found
>> at /sys/class/gpio
>
> I think the gpiochip entries represent the various banks of gpios.
>
> Philip
>
>>
>>
>> Regards,
>> S. Yassin
>> HW Engineer
>> DLECS
>>
>>
>> ________________________________
>> From: Philip Balister <phi...@balister.org>
>> To: Sameh Yassin <sameh_yassi...@yahoo.com>
>> Cc: GNURADIO <discuss-gnuradio@gnu.org>
>> Sent: Wednesday, May 2, 2012 1:33 PM
>> Subject: Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and FPGA
>>
>> On 05/01/2012 04:28 AM, Sameh Yassin wrote:
>>> Hello Dear ,
>>>
>>> I used the first link to use overo GPIOs on the E100 to communicate with
>>> the SPARTN3AN FPGA.
>>>
>>> I'm doing the following:
>>> 1- I chose an empty GPIO input to the FPGA (for example overo_gpio22).
>>> 2- I modified the FPGA image so that debug_led1 =
over_gpio220
>>> 3- I'll set and clear overo GPIO using the bash shell as I read in the
>>> first link that u recommended.
>>>
>>> The problem:
>>> Although the following gpios are free on the FPGA. There are other
>>>gpios valid on the overo. Srictly speaking
>>>
>>> The free GPIOs on the overo
>>> $ root@usrp-e1xx:/sys/class/gpio# ls
>>>
>>> exportgpio16 gpio168 gpiochip128 gpiochip192 gpiochip64 unexport
>>> gpio15gpio164 gpiochip0 gpiochip160 gpiochip32 gpiochip96
>>
>> It looks like you are running an older version of uhd, which suggests an
>> older kernel version. The older driver claimed a few extra gpio's for
>> testing purposes.
>>
>> I see:
>>
>> root@usrp-e1xx:~# ls
/sys/class/gpio/
>> export gpio16@ gpio173@ gpiochip128@ gpiochip32@ unexport
>> gpio114@ gpio164@ gpio175@ gpiochip160@ gpiochip64@
>> gpio15@ gpio168@ gpiochip0@ gpiochip192@ gpiochip96@
>>
>> Note the extra gpio's exposed to user space. These are used by uhd for
>> signaling and configuring the clock generator.
>>
>> Philip
>>
>>>
>>>
>>> The free gpios at the FPGA found at u1e.v
>>> input overo_gpio0, input overo_gpio14, input overo_gpio21, input
>>> overo_gpio22, // Misc GPIO
>>>
>>> input overo_gpio23, input overo_gpio64, input overo_gpio127, // Misc GPIO
>>> input overo_gpio176, input overo_gpio163, input overo_gpio170, // Misc GPIO
>>>
>>> Is that normal of I
did something wrong at the kernel at the overo?
>>>
>>> Regards,
>>> S. Yassin
>>> HW Engineer
>>> DLECS
>>>
>>>
>>> ________________________________
>>> From: Philip Balister <phi...@balister.org>
>>> To: Sameh Yassin <sameh_yassi...@yahoo.com>
>>> Cc: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org>
>>> Sent: Saturday, April 28, 2012 2:18 PM
>>> Subject: Re: [Discuss-gnuradio] E100 - Interface between OMAP3 and
FPGA
>>>
>>> On 04/28/2012 08:07 AM, Sameh Yassin wrote:
>>>> Dear all,
>>>>
>>>> I need to send data from the OMAP3 to the Spartan3an FPGA. As I understand
>>>> ,from the wiki and presentations, there are two ways to communicate
>>>> namely; using setting_reg and GPIO. The second way seems easier so I'll
>>>> try it first.
>>>>
>>>> I intend to set or clear the free GPIOS on the Spartan FPGA such as
>>>> over_gpio_22. I added the following code to the example tx_waveforms.cpp.
>>>>
>>>> static struct gpio gpio_test = { 22, GPIOF_OUT_INIT_LOW,
>>>>"OVERO_GPIO_22" };
>>>> gpio_set_value(22,1);
>>>> //set gpio22 which is connected to pin IO_L30N_0
>>>>
>>>>
>>>> I tried to compile then I got the error that
can't find GPIO.h.
>>>>
>>>> My question: did I use the correct high level function or I used a "lower
>>>> level" that is used to implement the function?
>>>
>>> This is the easiest way to toggle gpio's from userspace.
>>>
>>> http://wiki.gumstix.org/index.php?title=GPIO#Accessing_GPIO.27s_from_userland
>>>
>>> Also:
>>>
>>> http://elinux.org/GPIO
>>>
>>> The kernel on the e100 already supports the sysfs entries for gpio's.
>>> (UHD uses it)
>>>
>>> Philip
>>>
>>>>
>>>>
>>>>
>>>> Regards,
>>>> S.
Yassin
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list
>>>> Discuss-gnuradio@gnu.org
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio_______________________________________________
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